Article
Engineering, Chemical
Chuanxi Xu, Weiwei Zhang, Shui Hu, Peng Li, Shengyuan Jiang, Zongquan Deng
Summary: Collecting regolith samples with unmanned equipment is a popular method in aerospace exploration. The electrostatic sampler has powerful driving ability in low gravity environments. The study discusses a contact charging model for single particles and proposes a suspension balancing method for measuring their charges.
Article
Physics, Multidisciplinary
Forest Shih-Sen Chien, Chun-Rung Huang, Chi-Yuan Lin, Kwai-Kong Ng
Summary: Contact electrification has the potential to convert mechanical energy to electrical energy, with charge transfer between the Fermi level of the metal and the neutral level of the surface states of the polymer playing a significant role. The process is described by a saturating exponential function and the charge transfer can cancel out the net bias, ultimately leading to the cessation of contact electrification.
CHINESE JOURNAL OF PHYSICS
(2021)
Article
Chemistry, Physical
Zhihao Zhao, Yejing Dai, Di Liu, Xinyuan Li, Linglin Zhou, Baofeng Zhang, Jie Wang, Zhong Lin Wang
Summary: The use of inorganic single crystals as a friction layer in triboelectric nanogenerator improves the charge density of inorganic materials, overcoming their previous limitation. The charge density has reached its theoretical value in both air and vacuum conditions. Furthermore, the study establishes a quantitative understanding of the charge transfer mechanism between single crystals and metal, providing theoretical guidance for the contact electrification process of inorganic materials.
Article
Chemistry, Physical
Yusen Su, Andy Berbille, Zhong Lin Wang, Wei Tang
Summary: Chemical functional groups on solid surfaces play a vital role in contact electrification at water-solid interfaces. In this study, ion coupled plasma etching was used to modify a high-density polyethylene (HDPE) film and generate fluoride (HDPE-F) and hydroxyl (HDPE-OH) functional groups, which endowed HDPE with charge withdrawing ability. HDPE-F withdrew 2.5-2.7 times more charges than HDPE-OH, and the accumulated surface charges altered the motion of droplets. This study provides an alternative approach to study contact electrification and evaluate the contribution of electrons to solid-liquid CE, and also demonstrates the superior activity of HDPE-F in contact-electro-catalysis compared to commercial fluorinated films.
Article
Chemistry, Multidisciplinary
Kunming Shi, Bin Chai, Haiyang Zou, Zhen Wen, Meng He, Jie Chen, Pingkai Jiang, Xingyi Huang
Summary: This study demonstrates the crucial role of material transfer in adhesive polymers in contact electrification, which boosts charge transfer and the performance of triboelectric nanogenerators (TENGs).
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Sunay Dilara Ekim, Gorkem Eylul Kaya, Murat Dastemir, Erol Yildirim, H. Tarik Baytekin, Bilge Baytekin
Summary: This study investigates the contact charging and charge decay behavior of polydimethylsiloxane doped with organic charge transfer cocrystals. The results show that the composites exhibit antistatic properties and the discharging propensity depends on the charge transfer degree within the complexes.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Multidisciplinary
Chen Wang, Ruoqing Zhao, Wenru Fan, Lei Li, Haoyang Feng, Zexuan Li, Ci Yan, Xiaoyang Shao, Krzysztof Matyjaszewski, Zhenhua Wang
Summary: A facile approach for tribochemically controlled atom transfer radical polymerization (tribo-ATRP) was developed, which relies on contact-electro-catalysis (CEC) between titanium oxide (TiO2) particles and CuBr2/tris(2-pyridylmethylamine (TPMA), without any high-energy input. The friction induced by stirring electrifies the TiO2 particles, continuously reducing CuBr2/TPMA into CuBr/TPMA, thereby initiating ATRP. The design of tribo-ATRP enables CEC to access a variety of polymers with predetermined molecular weights, low dispersity, and high chain-end fidelity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Materials Science, Multidisciplinary
Andris Sutka, Linards Lapcinskis, Osvalds Verners, Liva Germane, Krisjanis Smits, Arturs Pludons, Sergejs Gaidukovs, Martins Zubkins, Kaspars Pudzs, Peter Cameron Sherrell, Juris Blums
Summary: This study presents a frictional electrification polymer inspired by the ordering in spider silk, which shows enhanced contact electrification by adding α-FeOOH nanowires. Experimental results demonstrate that this structural design can effectively promote mechanical energy harvesting of materials.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Chemistry, Physical
Xiuzhong Zhao, Xiao Lu, Qiwei Zheng, Lin Fang, Li Zheng, Xiangyu Chen, Zhong Lin Wang
Summary: Experimental results show that liquid droplets generate negative charges when falling through transformer oil, and both ion transfer and electron transfer occur during L-L contact electrification.
Article
Chemistry, Multidisciplinary
Zhen Tang, Shiquan Lin, Zhong Lin Wang
Summary: A contactless method combining electric field and acoustic field is proposed to quantify the charges on a liquid droplet, successfully applied in studying both liquid-solid and liquid-liquid contact electrification effects, with a focus on the behavior of negatively precharged liquid droplets in the liquid-liquid CE.
ADVANCED MATERIALS
(2021)
Article
Chemistry, Physical
Youbin Zheng, Shaochen Ma, Enrico Benassi, Yange Feng, Shiwei Xu, Ning Luo, Ying Liu, Li Cheng, Yong Qin, Miaomiao Yuan, Zuankai Wang, Daoai Wang, Feng Zhou
Summary: A new post-treatment antistatic strategy is demonstrated to significantly reduce the accumulation of static charge by controlling the spatial distribution of tribopositive and tribonegative regions. On-site interface charge neutralization between tribopositive and tribonegative regions leads to rapid charge decay, making it especially useful in some extreme scenarios.
Article
Physics, Fluids & Plasmas
Siddharth Rajupet, Adriaan A. Riet, Qizan Chen, Mamadou Sow, Daniel J. Lacks
Summary: Surface roughness affects electrostatic and van der Waals forces differently, with electrostatic forces being less affected and van der Waals forces diminishing significantly. When a particle contacts a rough conducting surface, electrostatic forces can dominate for particle sizes as small as around 1-10 μm.
Article
Multidisciplinary Sciences
Saranshu Singla, Dharamdeep Jain, Chelsea M. Zoltowski, Sriharsha Voleti, Alyssa Y. Stark, Peter H. Niewiarowski, Ali Dhinojwala
Summary: This study identified the involvement of acid-base interactions between polar lipid head-groups on gecko setal surfaces and sapphire, and demonstrated the role of cohesive failure within the lipid layer in reducing setal wear during high stress sliding. Absence of the lipid layer was found to enhance adhesion, despite a small setal-substrate contact area. These results challenge the traditional view that gecko adhesion is solely based on vdW forces and is residue-free.
Article
Chemistry, Multidisciplinary
Fan Wang, Peng Yang, Xinglin Tao, Yuxiang Shi, Shuyao Li, Zhaoqi Liu, Xiangyu Chen, Zhong Lin Wang
Summary: The study investigates the electrification mechanism at liquid-gas interfaces by using an acoustic levitation method. Positive charges are generated on water droplets due to the tribomotion induced by ultrasound wave, with the charge amount reaching saturation within 30s. The presence of solid particles in droplets increases the transferred charge amount, while higher ion concentration suppresses charge generation.
Article
Chemistry, Multidisciplinary
Xinglin Tao, Jinhui Nie, Shuyao Li, Yuxiang Shi, Shiquan Lin, Xiangyu Chen, Zhong Lin Wang
Summary: The saturated charge density of liquid-solid contact electrification at the L-S interface can be further increased under ultraviolet light, which helps enhance the performance of the TENG. This discovery offers a new approach to improve the efficiency of L-S TENG and promotes its applications in various fields.
Article
Oncology
Kevim Bordignon Guterres, Grazielle Guidolin Rossi, Marli Matiko Anraku de Campos, Kelly Schneider Moreira, Thiago Augusto Lima Burgo, Bernardo Almeida Iglesias
Summary: In this study, the photoinactivation evaluation of Ag(II) porphyrins in the antimicrobial photodynamic therapy of rapidly growing mycobacterial strains was reported. The results showed that Ag(II) porphyrins significantly reduced the concentration of viable mycobacteria and induced potential structural damage.
PHOTODIAGNOSIS AND PHOTODYNAMIC THERAPY
(2022)
Article
Engineering, Chemical
Rafaela Oliveira Pilecco, Kiara Serafini Dapieve, Gabriela Carrao Aragonez, Luis Felipe Guilardi, Guilherme Schmitt de Andrade, Kelly Schneider Moreira, Thiago Augusto de Lima Burgo, Renata Marques de Melo, Luiz Felipe Valandro, Marilia Pivetta Rippe
Summary: This study aimed to evaluate the resin microshear bond strength and surface topography of lithium disilicate ceramic milled by CAD/CAM, comparing it with various in-lab methods. The results showed no significant difference in resin bond strength between in-lab simulation methods and CAD/CAM milling, with surface polishing underestimating bond results.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Chemistry, Physical
Rafael F. N. Quadrado, Henrique F. V. Vitoria, Daniele C. Ferreira, Klaus Krambrock, Kelly S. Moreira, Thiago A. L. Burgo, Bernardo A. Iglesias, Andre R. Fajardo
Summary: Polymer aerogels were prepared as support materials for cationic porphyrin organocatalysts, and their catalytic activity in the photodegradation of pharmaceuticals was investigated. The CPA-TMPyPMn aerogel demonstrated superior catalytic potential, achieving rapid degradation of the pharmaceuticals and high COD removal rates. Furthermore, the hybrid aerogel showed recyclability.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2022)
Article
Engineering, Biomedical
Gabriela Carrao Aragonez, Rafaela Oliveira Pilecco, Kiara Serafini Dapieve, Thiago Augusto Lima Burgo, Luis Felipe Guilardi, Catina Prochnow, Luiz Felipe Valandro, Marilia Pivetta Rippe
Summary: This study aimed to investigate the effects of different laboratory protocols simulating CAD/CAM milling on the topography and fatigue performance of lithium disilicate glassceramic. The results showed that the surface created by CAD/CAM milling and the polished surface exhibited better fatigue performance and more complex topography compared to other methods.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Engineering, Biomedical
ThiagoA. L. Burgo, Gabriel Kalil Rocha Pereira, Bernardo Almeida Iglesias, Kelly S. Moreira, Luiz Felipe Valandro
Summary: This paper discusses the use of various AFM techniques to explore the properties of Y-TZP samples modified by different surface treatments, emphasizing the importance of AFM in accurately describing adhesive properties. The study highlights the potential of AFM as a key tool in investigating the complex nature of biomaterials and bridging fragmented disciplines such as solid-state physics, microbiology, and dental sciences.
JOURNAL OF THE MECHANICAL BEHAVIOR OF BIOMEDICAL MATERIALS
(2022)
Article
Immunology
Fallon dos Santos Siqueira, Josieli Demetrio Siqueira, Laura Bedin Denardi, Kelly Schneider Moreira, Thiago Augusto Lima Burgo, Lenice de Lourenco Marques, Alencar Kolinski Machado, Carolina Bordin Davidson, Otavio Augusto Chaves, Marli Matiko Anraku de Campos, Davi Fernando Back
Summary: Antibiotic resistance associated with pulmonary infection agents is a pressing public health concern. The synthesis of molecules from pre-existing drugs has shown promise in increasing therapeutic options against resistant microorganisms.
MICROBIAL PATHOGENESIS
(2023)
Article
Oncology
Carolina Gonzalez Urquhart, Ticiane da Rosa Pinheiro, Jean Lucas Gutknecht da Silva, Daniela Bitencourt Rosa Leal, Thiago Augusto Lima Burgo, Bernardo Almeida Iglesias, Roberto Christ Vianna Santos
Summary: This manuscript investigates the cytotoxicity, antimicrobial activity, antibiofilm preliminary properties, and associated therapy of water-soluble tetra-cationic porphyrins against Pseudomonas aeruginosa. The study finds that porphyrin 4H2TMePor exhibits better antimicrobial activity and can inhibit bacterial growth through irradiation. The photosensitizer shows no toxicity to human keratinocytes or mouse fibroblasts. With its excellent antimicrobial and preliminary antibiofilm activity, water-soluble tetra-cationic porphyrins have the potential to be used as a clinical photosensitizer.
PHOTODIAGNOSIS AND PHOTODYNAMIC THERAPY
(2023)
Article
Environmental Sciences
Hercules A. Pereira, Katia da Boit Martinello, Yasmin Vieira, Julia C. Diel, Matias S. Netto, Gabriel D. Reske, Ezequiel Lorenzett, Luis F. O. Silva, Thiago A. L. Burgo, Guilherme Luiz Dotto
Summary: The present study synthesized two new materials, MWCNT-OH-Mag and MWCNT-COOH-Mag, by functionalizing multi-walled carbon nanotubes (MWCNT) with magnetite (Fe3O4) using solution precipitation methodology. These materials were characterized using various techniques and showed effective impregnation and regular distribution of nanoparticles on the surface. Batch studies indicated that MWCNT-OH-Mag exhibited superior adsorption performance for 2,4-D and Atrazine pollutants, with optimal pH conditions of 2 and 6, respectively. The adsorption kinetics reached equilibrium within 30 minutes, and the Sips model accurately described the adsorption isotherms. The synthesized materials demonstrated high stability in aqueous solutions and showed promising potential for water purification through adsorptive separation.
Article
Oncology
Carolina Ferreira Amorim, Bernardo Almeida Iglesias, Ticiane Rosa Pinheiro, Luiz Eduardo Lacerda, Ana Rita Sokolonski, Beatriz Oliveira Pedreira, Kelly Schneider Moreira, Thiago Augusto Lima Burgo, Roberto Meyer, Vasco Azevedo, Ricardo Wagner Portela
Summary: Cationic porphyrins can effectively photo-inactivate different species of Candida and reduce their adhesion to the surface. These porphyrins have a broad spectrum of antimicrobial action and can inhibit the growth of Candida completely under photodynamic therapy conditions.
PHOTODIAGNOSIS AND PHOTODYNAMIC THERAPY
(2023)
Article
Engineering, Mechanical
Oscar A. Aguilar-Rosas, Leonardo I. Farfan-Cabrera, Ali Erdemir, Julio Alberto Cao-Romero-Gallegos
Summary: The increasing demand for hybrid and electric vehicles has presented new challenges for the lubricant industry. The performance of lubricants for electric vehicles is influenced by factors such as high starting torques, high RPMs, and shaft currents passing through the contact interfaces. However, there are currently no standard test protocols for evaluating lubricants under electrified conditions. This research aims to explore the four-ball ASTM-D4172 standard method to evaluate the tribological behavior of lubricants under electrified conditions.
Article
Engineering, Mechanical
Julio A. Cao-Romero-Gallegos, Leonardo I. Farfan-Cabrera, Ali Erdemir, Juan B. Pascual-Francisco
Summary: The electrification of drivelines in electric vehicles can lead to harmful shaft voltages/currents that can damage the tribological performance of sliding and rolling elements. This study specifically investigates the effects of DC electrification on the lubricated sliding friction and wear behavior of gear materials. The results show that electrification significantly influences friction and wear, increases contact temperature, and accelerates oxidation at the sliding interfaces.
Article
Engineering, Mechanical
Leonardo I. Farfan-Cabrera, Julio A. Cao-Romero-Gallegos, Seungjoo Lee, Merve Uysal Komurlu, Ali Erdemir
Summary: Most moving components and lubricants in the automotive industry are being reengineered to meet the harsher conditions of electric vehicles (EVs). Diamond-like carbon (DLC) coatings have been widely used in this field due to their lower friction and wear coefficients, chemical inertness, corrosion resistance, and hardness. However, their performance under electrified sliding conditions of EVs has not been evaluated.
Article
Pharmacology & Pharmacy
Ticiane da Rosa Pinheiro, Gabrielle Aguiar Dantas, Jean Lucas Gutknecht da Silva, Daniela Bitencourt Rosa Leal, Ricardo Barreto da Silva, Thiago Augusto de Lima Burgo, Roberto Christ Vianna Santos, Bernardo Almeida Iglesias
Summary: This study evaluated the in vitro activity of cationic porphyrins with platinum(II) complexes against Candida albicans. The results showed that 3PtTPyP exhibited excellent antifungal activity and reduced preformed biofilms effectively.
Article
Engineering, Multidisciplinary
Kelly S. Moreira, Yan A. Santos da Campo, Ezequiel Lorenzett, Thiago A. L. Burgo
Summary: In this study, a sandwich-type triboelectric nanogenerator was constructed using aseptic carton packaging material. This nanogenerator efficiently converts mechanical energy to electrical energy, with comparable efficiency to nanoengineered devices but at a fraction of the cost. It can be used as a low-cost energy harvesting device and an environmentally friendly solution for food packaging.
RESULTS IN ENGINEERING
(2023)
Article
Infectious Diseases
Fabiana de Cassia Romanha Sturmer, Paulo Ricardo Moreira, Juliana Felipetto Cargnelutti, Leonardo Quintana Soares Lopes, Ezequiel Lorenzett, Thiago Augusto de Lima Burgo, Roberto Christ Vianna Santos
Summary: This study demonstrates the persistence of B. cereus in the hemodialysis system, highlighting its ability to form biofilms, produce virulence factors, and exhibit resistance to antimicrobial drugs.
REVISTA DO INSTITUTO DE MEDICINA TROPICAL DE SAO PAULO
(2022)
